Hello,
btrfs_extent_post_op calls finish_current_insert and
del_pending_extents. They both may enter infinite loop.
finish_current_insert enters infinite loop if it only
finds some backrefs to update. The infinite loop in
del_pending_extents is due to a variable not properly
set. Thank you,
Signed-off-by: Yan Zheng <zheng.yan@xxxxxxxxxx>
---
diff -urp 1/fs/btrfs/extent-tree.c 2/fs/btrfs/extent-tree.c
--- 1/fs/btrfs/extent-tree.c 2009-01-07 07:16:42.762364700 +0800
+++ 2/fs/btrfs/extent-tree.c 2009-01-20 13:36:07.000000000 +0800
@@ -2159,7 +2159,8 @@ again:
ret = find_first_extent_bit(&info->extent_ins, search, &start,
&end, EXTENT_WRITEBACK);
if (ret) {
- if (skipped && all && !num_inserts) {
+ if (skipped && all && !num_inserts &&
+ list_empty(&update_list)) {
skipped = 0;
search = 0;
continue;
@@ -2547,6 +2548,7 @@ again:
if (ret) {
if (all && skipped && !nr) {
search = 0;
+ skipped = 0;
continue;
}
mutex_unlock(&info->extent_ins_mutex);
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